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Service Valves
The liquid line and vapor line service valves (figures 9 and
10) and gauge ports are used for leak testing, evacuating,
charging and checking charge. See table 3 for torque re-
quirements
Each valve is equipped with a service port which has a fac-
tory−installed Schrader valve. A service port cap protects
the Schrader valve from contamination and serves as the
primary leak seal.
Table 3
Torque Requirements
Part
Service valve cap
Sheet metal screws
Machine screws #10
Compressor bolts
Gauge port seal cap
To Access Schrader Port:
1 − Remove service port cap with an adjustable wrench.
2 − Connect gauge to the service port.
3 − When testing is completed, replace service port cap.
Tighten finger tight, then an additional 1/6 turn.
To Open Service Valve:
1 − Remove the stem cap with an adjustable wrench.
2 − Use a service wrench with a hex−head extension to
back the stem out counterclockwise as far as it will go.
NOTE − Use a 3/16" hex head extension for liquid line
sizes or a 5/16" extension for vapor line sizes.
Recommended Torque
8 ft.− lb.
11 NM
16 in.− lb.
2 NM
28 in.− lb.
3 NM
90 in.− lb.
10 NM
8 ft.− lb.
11 NM
3 − Replace the stem cap. Tighten finger tight, then tighten
an additional 1/6 turn.
Liquid Service Valve
service
port
to outdoor coil
service
port cap
Schrader valve open
to line set when valve is
closed (front seated)
Liquid Service Valve
insert hex
wrench here
service
port
to outdoor coil
service port
cap
Schrader
valve
Page 10
(Valve Closed)
insert hex
wrench here
to indoor coil
(valve front seated)
(Valve Open)
to indoor coil
Figure 9
stem cap
stem cap
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